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A. HARDY & G. A. ROLLINS.

ROTARY SHEARS.

N0.18,506. Patented Oct. 27, 1857.

UNITED STATES PATENT OFFICE.

ANSON HARDY, OF BOSTON, MASSACHUSETTS, AND GEO. A. ROLLINS, OF NASHUA, NEW HAMPSHIRE.

ROTARY SHEARS.

Specification of Letters Patent No. 18,506, dated October 27, 1857.

To all whom it may concern Be it known that we, Anson HARDY, of Boston, in the county of Suffolk and State of Massachusetts, and GEORGE A. ROLLINS, of Nashua, in the county of Hillsboro and State of New Hampshire, have invented certain new and useful Improvements in R0- tary Shears; and we do hereby declare the following to be a full, clear, and eXact description of the construction and operation of the same, reference being had to the accompanying drawings, making a part of this description, in which Figure 1 represents a perspective of the shears. Fig. 2, represents a vertical cross section through the clamp, carriage, and ways.

Similar letters of reference where they ocour in the separate figures denote like parts of the machine in both.

The nature of our invention consists in the manner in which we have arranged the rotary cutting blades, carriage, its stop and clamps, on the frame, so that we have greater facilities for bringing the sheets in their uncut state up to the shears to be operated on by them.

To enable others skilled in the art to make and use our invention, we will proceed to describe the same with reference to the drawings.

A, represents the bed or frame of the machine, in which are cast two hollow portions B, 0, through which pass respectively the shafts D, E, that carry the cutting blades F, G, at one of their ends, and pinions H, I, at their other ends, said pinions gearing with one another, and set in motion by the balance wheel J, and crank K, or by any other mechanical power. On the hollow part B, of the frame, and at each end thereof are cast lugs a, a, (and on both sides, one side only being seen in the perspective) through which set screws 6, 7), pass, one set of them (6) pressing against the shear blade F, and the other set (7)) pressing against the pinion H--the object being to adjust the shear blade F, to the one Gr above it, and with which it works. The blade G, is hung eccentrically on its shaft E, and a handle or lever 0, attached to said shaft projects through a slot (Z, in the frame so that by raising or lowering said lever, the blade shall be thrown down to lap past the lower blade, or be raised up out of action therewith.

Two rails L, M, are secured to the base plate, bed, or frame A, parallel to each other, and furnishedone or both, with grooves, into which a flange e, on the carriage N, may take to hold it thereto, as it (the carriage) traverses said rails. A hinged stop f (in dotted lines Fig. 1,) is placed on the inner side of one of the rails, against which the carriage will stop when the piece f, is raised up and rests against the stud 9', but will pass over, when said piece f, is turned down as shown in the drawings. This stop f, must be so placed that, when the carriage is held by it, the vertical axes of the clamps h, 2', shall be in line with a vertical plane drawn through the cutting point of the blades F, G. The clamps h, z, are so arranged as that they may freely turn on their axes, while the upper one 71, may be run down close against the lower one '6, by means of the screw, and hand lever O. The axes of these clamps h, i, as also the hand screw 0, are arranged in a beam P, which has two horizontal projections Q, Q, upon it, that slide on the end pieces of the carriage N. In these end pieces are made dovetail grooves m, into which the square head of a screw bolt a passes, the shank of said screw passing up through the projections Q, and caught by a nut 1", having a lever 8, connected to it by which means the beam P, holding the sheet to be out, is rigidly held, at the desired position on the carriage while the carriage itself is free to be moved on the rails L, M, unless stopped by the piece f, as heretofore described. On one of the end pieces N, of the carriage there is a graduated scale t, over which an indicator 1), attached to one of the pieces Q, passes, and by these means the clamps can be so set with regard to the shears, as to cut pieces of the desired diameter or width. If the stop f, be let down as at present shown in the drawing, and a sheet of metal, or other material, placed between the clamps, and the carriage run past the blades, the sheet would be cut straight. But when the stop f, is raised the sheet would be cut straight until the carriage reached the stop and then the sheet with the clamps would be rotated by the drawing of the shear blades and at the same time be cut into a perfectly circular form. The distance that the clamps are from the shears regulates the diameter of the thing to be cut. By putting a piece either square or of any irregular form between the clamps, and run up the carriage, the shears will cut a linetangential to the circle to be cut, until said tangential line meets the circumference of the circle, and then they cut it in circular form, so that it is immaterial what the shape of the sheet may be, so long as it has surface enough to make the diameter of the circle.

We have said that the shear blade G, was hung eccentrically upon its shaft E-this not actually necessary, for it may be hung concentrically on its shaft, and said shaft pass through an eccentric sleeve, so that the turning of the sleeve will raise and lower the shear blade.

Vitnesses E. W. HOWE, J. H. JACKSON. 

